arch/sparc/kernel/leon_pci.c

   1 /*
   2  * leon_pci.c: LEON Host PCI support
   3  *
   4  * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom
   5  *
   6  * Code is partially derived from pcic.c
   7  */
   8
   9 #include <linux/of_device.h>
  10 #include <linux/kernel.h>
  11 #include <linux/pci.h>
  12 #include <linux/export.h>
  13 #include <asm/leon.h>
  14 #include <asm/leon_pci.h>
  15
  16 /* The LEON architecture does not rely on a BIOS or bootloader to setup
  17  * PCI for us. The Linux generic routines are used to setup resources,
  18  * reset values of configuration-space register settings are preserved.
  19  *
  20  * PCI Memory and Prefetchable Memory is direct-mapped. However I/O Space is
  21  * accessed through a Window which is translated to low 64KB in PCI space, the
  22  * first 4KB is not used so 60KB is available.
  23  */
  24 void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
  25 {
  26         LIST_HEAD(resources);
  27         struct pci_bus *root_bus;
  28
  29         pci_add_resource_offset(&resources, &info->io_space,
  30                                 info->io_space.start - 0x1000);
  31         pci_add_resource(&resources, &info->mem_space);
  32
  33         root_bus = pci_scan_root_bus(&ofdev->dev, 0, info->ops, info,
  34                                      &resources);
  35         if (root_bus) {
  36                 /* Setup IRQs of all devices using custom routines */
  37                 pci_fixup_irqs(pci_common_swizzle, info->map_irq);
  38
  39                 /* Assign devices with resources */
  40                 pci_assign_unassigned_resources();
  41         } else {
  42                 pci_free_resource_list(&resources);
  43         }
  44 }
  45
  46 void pcibios_fixup_bus(struct pci_bus *pbus)
  47 {
  48         struct pci_dev *dev;
  49         int i, has_io, has_mem;
  50         u16 cmd;
  51
  52         list_for_each_entry(dev, &pbus->devices, bus_list) {
  53                 /*
  54                  * We can not rely on that the bootloader has enabled I/O
  55                  * or memory access to PCI devices. Instead we enable it here
  56                  * if the device has BARs of respective type.
  57                  */
  58                 has_io = has_mem = 0;
  59                 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
  60                         unsigned long f = dev->resource[i].flags;
  61                         if (f & IORESOURCE_IO)
  62                                 has_io = 1;
  63                         else if (f & IORESOURCE_MEM)
  64                                 has_mem = 1;
  65                 }
  66                 /* ROM BARs are mapped into 32-bit memory space */
  67                 if (dev->resource[PCI_ROM_RESOURCE].end != 0) {
  68                         dev->resource[PCI_ROM_RESOURCE].flags |=
  69                                                         IORESOURCE_ROM_ENABLE;
  70                         has_mem = 1;
  71                 }
  72                 pci_bus_read_config_word(pbus, dev->devfn, PCI_COMMAND, &cmd);
  73                 if (has_io && !(cmd & PCI_COMMAND_IO)) {
  74 #ifdef CONFIG_PCI_DEBUG
  75                         printk(KERN_INFO "LEONPCI: Enabling I/O for dev %s\n",
  76                                          pci_name(dev));
  77 #endif
  78                         cmd |= PCI_COMMAND_IO;
  79                         pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
  80                                                                         cmd);
  81                 }
  82                 if (has_mem && !(cmd & PCI_COMMAND_MEMORY)) {
  83 #ifdef CONFIG_PCI_DEBUG
  84                         printk(KERN_INFO "LEONPCI: Enabling MEMORY for dev"
  85                                          "%s\n", pci_name(dev));
  86 #endif
  87                         cmd |= PCI_COMMAND_MEMORY;
  88                         pci_bus_write_config_word(pbus, dev->devfn, PCI_COMMAND,
  89                                                                         cmd);
  90                 }
  91         }
  92 }
  93
  94 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
  95                                 resource_size_t size, resource_size_t align)
  96 {
  97         return res->start;
  98 }
  99
 100 int pcibios_enable_device(struct pci_dev *dev, int mask)
 101 {
 102         return pci_enable_resources(dev, mask);
 103 }
 104
 105 /* in/out routines taken from pcic.c
 106  *
 107  * This probably belongs here rather than ioport.c because
 108  * we do not want this crud linked into SBus kernels.
 109  * Also, think for a moment about likes of floppy.c that
 110  * include architecture specific parts. They may want to redefine ins/outs.
 111  *
 112  * We do not use horrible macros here because we want to
 113  * advance pointer by sizeof(size).
 114  */
 115 void outsb(unsigned long addr, const void *src, unsigned long count)
 116 {
 117         while (count) {
 118                 count -= 1;
 119                 outb(*(const char *)src, addr);
 120                 src += 1;
 121                 /* addr += 1; */
 122         }
 123 }
 124 EXPORT_SYMBOL(outsb);
 125
 126 void outsw(unsigned long addr, const void *src, unsigned long count)
 127 {
 128         while (count) {
 129                 count -= 2;
 130                 outw(*(const short *)src, addr);
 131                 src += 2;
 132                 /* addr += 2; */
 133         }
 134 }
 135 EXPORT_SYMBOL(outsw);
 136
 137 void outsl(unsigned long addr, const void *src, unsigned long count)
 138 {
 139         while (count) {
 140                 count -= 4;
 141                 outl(*(const long *)src, addr);
 142                 src += 4;
 143                 /* addr += 4; */
 144         }
 145 }
 146 EXPORT_SYMBOL(outsl);
 147
 148 void insb(unsigned long addr, void *dst, unsigned long count)
 149 {
 150         while (count) {
 151                 count -= 1;
 152                 *(unsigned char *)dst = inb(addr);
 153                 dst += 1;
 154                 /* addr += 1; */
 155         }
 156 }
 157 EXPORT_SYMBOL(insb);
 158
 159 void insw(unsigned long addr, void *dst, unsigned long count)
 160 {
 161         while (count) {
 162                 count -= 2;
 163                 *(unsigned short *)dst = inw(addr);
 164                 dst += 2;
 165                 /* addr += 2; */
 166         }
 167 }
 168 EXPORT_SYMBOL(insw);
 169
 170 void insl(unsigned long addr, void *dst, unsigned long count)
 171 {
 172         while (count) {
 173                 count -= 4;
 174                 /*
 175                  * XXX I am sure we are in for an unaligned trap here.
 176                  */
 177                 *(unsigned long *)dst = inl(addr);
 178                 dst += 4;
 179                 /* addr += 4; */
 180         }
 181 }
 182 EXPORT_SYMBOL(insl);